342 KEY. E. BOOa WATSON" ON THE 



posteriorly produced ; the generic twisted sinus is ratter small ; 

 above it the lip rises and advances, and forms a sharp curve : 

 from this point the lip runs out to the right, at first straight or 

 faintly concave, and here a little contracted, but afterwards with 

 a very regular curve, and increasingly patulous to the point 

 of the shell. Top yerj obliquely truncate, with a bluntish edge 

 and a small funnel-shaped depression, which, through the generic 

 sinus, leads into the interior of the shell. Inner Up : there is 

 no glaze on the body, the curve of which is a little gibbous above : 

 the pillar-edge is narrow, reverted, bluntly toothed, twisted, and 

 truncated in front; at the base of the pillar this edge is very 

 much twisted, and is there separated from the body, leaving a 

 very narrow but deep fissure communicating with the deep um- 

 bilicus which lies behind, and is partly covered by the expanded 

 and projecting pillar-edge. H. 0*44. B. 0"24. Breadth of mouth 

 at same place 0*07. 



I do not know any Atys with which to compare this very beau- 

 tiful and delicate species. It has something of the gibbosity 

 oiAtys cylinclrica, Helb., var. solida, in its stumpiest forms ; but 

 the texture of the shell, the sculpture, and the umbilicus are very 

 difi"erent. The specimens from St. 186 and 187 are quite young 

 shells, but are, I have no doubt, this species. From Honolulu, 

 40 fms., there is a specimen of Atys probably belonging to this 

 species, but in too bad condition for identification with any 

 certainty. 



G-en. ScAPHANDEK, Mont. 



1. S. m?mc?MS, n. sp. I 3. S. gracilis, n. s\>. 



2. S. niveus, n. sp. | 



1. Scaphander mundtjs, n. sp. 



St. 191. Sept. 23, 1874. Lat. 5° 41' S.,long. 134° 4' E. Off 

 Arru Island, W. of Papua. 800 fms. Eine sand. Bottom tem- 

 perature 39°'5. 



Shell. — Obliquely oval, above narrowed obliquely, concavely 

 truncated, and on the right bluntly pointed ; below rounded, thin, 

 opaque, ivory-white, glossy, stippled in spiral lines. Sculpture. 

 Longitudinals — there are very fine hair-like lines of growth with 

 slight irregular interrupted and unequal undulations. Spirals — 

 the whole shell is covered with small shallow distant impressed 

 dots : these above are roughly rounded or obliquely longitudinal ; 



